Sliding closure



5. w. NICHOLSON s IDING CLOSURE Dec. 0, 1

31mm Sta Z (y, WAZCZ a Z sun 2 Sheets-Sheet 1 Filed Aug.., 28, 1922 Dec, 30,

S. W. NICHOLSON SLIDING CLOSURE Filed Aug; 28, 1922 2 Sheets-Sheet 2 I H IP I H I I" I" I Stank 1 Wife/025022 Patented Dec. 30, 1924.

UNITED STATES PATENT! OFFICE.

STANLEY W. NICHOLSON, OF TOLEDO, OHIO, ASSIGNO'R TO THE DURA COMPANY, OF TOLEDO, OHIO, A CORPORATION OF DELAWARE.

SLIDING CLOSURE.

Application 'filed August 28, 1922. Serial No. 584,724.

To all whom it may concern:

Be it known that I, STANLEY W. N10110:.- soN, a citizen of the United States of America, residing at Toledo, in the county of Lucas and State of Ohio, have invented close to one of the side edges of the window. When the closure is thus subjected to an unbalanced force there is created a turn-' ing moment acting in the plane ofthe closure resulting in a tendency of diagonally opposed corners of the closure to bind. The tendency to bind is accentuated when the width of the closure is relatively great as compared to its height and is further accentuated in case the glass plate which ordinarily forms the closure has either or both of its opposite edges convex.

It is the object of the invention to so form a sliding closure that the bearing points will be in close proximity to the ends of the glass so as to minimize any tilting tendency arising from unbalanced actuating or counter-balancing forces.

In the drawings Figure 1 is a view in side elevation of a vehicle window equipped with the improved closure;

Figure 2 is an enlarged view of an edge portion of said closure;

Figure 3 is a view similar to Figure 2 but showing means for actuating and counter-balancing 'the glass engaging the latter respectively adjacent its opposed e es.

n these views the reference character 1 designates a frame formedwith a window opening 2 adapted to be closed by a vertlcally slidin closure 3 ordinarilyhaving the nature 0% a glass plate. The 0 posed edges of said plate travel in runways ormed preferably of channeled strips 4 adjacent each of its vertical edges. The closure 3 is engaged by an actuating means 5 having ing the sliding closure is applied relatively the nature of a rod secured to the glass near its lower edge and extending upward to permit the handle 5 u on its upper end to be constantly accessible within the window opening. Adjacent its other vertical edge the glass 3 is engaged by a counterbalanc ing coiled sprin 6. The particular actuating and counteralancing devices, as shown, are not original with this application being disclosed in co-pending application Serial Number 562,869, filed May 22, 1922. It will be readily evident that the glass-3 is subjected more or less to a tilting tendency when an upward or downward thrust is exerted through the rod 5 due to the fact that the force thus applied is unbalanced. In lowering the window this tilting tendency is accentuated by the'up-pull of the counter-balancing spring 6. In order to minimize such tilting tendency-it is desirable to insure bearings for the glass as close as possible to the extremities of the same.

This effect the invention secures by concavely curving the side edges of the plate 3, as indicated at 7 (see Figure 2). Such curvature of the side edges eliminates any intermediate point of bearing of the glass upon the runway 4 and insures the location of said bearing points in close proximity to the upper and lower extremities of the glass, as indicated at 7*.

By thus curving the bearing edges of. the glass the tilting tendency is minimized and also the area of frictional contact of the glass and runway is reduced so as to allow the glass to travel more freely in the runways.

What I claim as my invention is z- 1. A sliding glass plate having its bearing edges concavely curved between the extremities thereof to insurepoints of bearing adjacent said extremities.

2. The combination with a sliding glass plate, and means for applyin an unbalanced force to said plate int e direction of travel thereof, the width of said plate being slightly reduced intermediate its end portions to form slide bearing points for the plate in close proximity to said extremities to'thereby minimize the tilting tendency arising from the unbalanced force. I

In testimony whereof I affix my signature.

STANLEY W. NICHOLSON. 

